Click to expand.We've tested both the MSi Radeon 2PMD3GDS 'vanilla' HD 7970 and the XFX Double D HD 7970 GHz Edition FX797GTDFC. Both work perfectly although we prefer the XFX, of course. Noise is much better (ie. Radeon HD 7950 Mac. Radeon Pro 560. T-Rex, Manhattan, Cloud Gate Factor. GPUBoss recommends the AMD Radeon Pro 455. Benchmarks Real world tests of Radeon Pro 455 vs HD 7950 Mac. Bitcoin mining Data courtesy CompuBench. Radeon Pro 455. 163.13 mHash/s. Quieter) than the oscillating, loud, and generally more irritating GTX 570 that we had been running previously. Quieter than dual 5870's but louder than a single, 'Apple Stock' 5870. Yes, 3 monitors do work. Tested 3 Apple LED Cinema Displays in vertical (90 rotated mode) with 2 of the monitors connected to the mDP ports and 1 connected via the Atlona Dual Link DVI to Mini DisplayPort Converter (powered by USB). Microsoft onenote for mac youtube. Worked perfectly. Click to expand.I think you're fuzzing math. The 6-pin is 75w and 8-pin is 150w. PCI slots offer combined 300w (450w total). Already tested with full burn-in render tests and real-work RED R3D 4K files (debayering and rendering for final). ![]() *But perhaps to your point, you can't stuff a Quadro in with this thing or think about SLI-mode (although why would you?). The Mac Pro can handle the 7970 perfectly well. Just play nice with your other PCI slots. ESATA and USB cards are fine. We've even got a RED Rocket in one of ours. But that's the red line. I assume you appreciate that plugging an 8-pin into the 6-pin motherboard header does not magically deliver 150W? It delivers the 75W from the header (but allows the card to draw more, exceeding the design spec of the 6-pin cable and traces). The TDP of the 7970 GHz Edition is listed as 275W. That is significantly over the Mac Pro's 225W limit which is made up of 75W from the PCI slot, 75W from the first 6-pin and 75W from the second 6-pin that you have put the 8-pin cable into. While your card does run, you are depending on the ability of the traces on the logic board to deliver the extra current that the card is drawing. In fact the card will probably be throttling itself down to protect the logic board since that model has the ability to do so. Click to expand.Same page. Not sure why you're suggesting I'm not aware of this. Visualiser for spotify mac download. There's no magic here. It's pulling 75w+150w on those lines. However, it's not exceeding the design spec at all. In fact, the only difference between a 6 pin and an 8 pin connection is the number of grounds. Both use 3x 12v rails. The 6 pin has 3 grounds and the 8 pin uses 5. Pins 1-3 are hot, 4-6 are ground + 7-8 ground. So those two extra pins are grounds only. They tell the graphics card it's ok to draw 150w -- which it is. Exceeding the design spec? Click to expand.The MP has a limit of 300w across the 4 PCI slots and that 8-pin adapter does, as you said, allow the card to pull down more watts. We're not exceeding the LB or the PSU or even uncomfortably close to it. There is nothing unsafe about running this card either. You're being quite a bit alarmist here. *Edit: The reason I keep pointing out the PCI lanes are 300w combined, is because that's how the LB is wired to power them; as a 300w lumped together channel. We're not overdrawing the lane and we're well within what's needed from the PSU.
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